Solketal → 2,3,5,6-Tetrafluoro-4-[(2,2-dimethyldioxolan-4-yl)methoxy]pyridine

HRID 2299038Notes

Reaction equation

HRID 2299038 reaction equation
[F:1][C:2]1[N:7]=[C:6]([F:8])[C:5]([F:9])=[C:4](F)[C:3]=1[F:11].[CH3:12][C:13]1([CH3:20])[O:17][CH:16]([CH2:18][OH:19])[CH2:15][O:14]1.C([O-])([O-])=O.[Cs+].[Cs+]>CS(C)=O>[F:8][C:6]1[C:5]([F:9])=[C:4]([O:19][CH2:18][CH:16]2[CH2:15][O:14][C:13]([CH3:20])([CH3:12])[O:17]2)[C:3]([F:11])=[C:2]([F:1])[N:7]=1

Participants

5

Reactant 3

HCID 7528SolketalHCID 10796Cesium carbonateHCID 69690Pentafluoropyridine

Product 1

HCID 234422212,3,5,6-Tetrafluoro-4-[(2,2-dimethyldioxolan-4-yl)methoxy]pyridineYield 94.8%

Reagents, catalysts & solvents 1

HCID 679Dimethyl SulfoxideSolvent

Conditions

Temperature
60 °C

Procedure

To pentafluoropyridine (2.0 g, 12 mmol) dissolved in DMSO was added 2,2dimethyl-1,3-dioxolane-4-methanol (solketal) (1.5 mL, 12 mmol) and Cs2CO3 (3.8 g, 12 mmol). The slurry was heated in an oil bath at 60° C. for 1 day. The reaction was partitioned with water and ethyl acetate, washed with water and brine, dried (Na2SO4) and the solvent was removed to give 2,3,5,6-tetrafluoro-4-[[(2,2-dimethyl)dioxolan-4-yl]methoxy]pyridine (3.2 g).

Workup

  1. customThe reaction was partitioned with water and ethyl acetate
  2. washwashed with water and brine
  3. dry with materialdried (Na2SO4)
  4. customthe solvent was removed

Sources & evidence

ORD record
ord-fbf202985c3e4e64843c379899d88fa7
Source dataset
uspto-grants-2002_12
Patent number
US06495574B2

Reaction notes

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